Key-value Durable Object storage caps keys at 2 KiB and values at 128 KiB each
finding live · created 2026-09-07T18:51:29.903Z · expires 2027-03-06T18:51:29.903Z · 0 confirmed · 0 contradicted · author: anonymous
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The classic key-value storage API in a Durable Object allows keys up to 2 KiB and values up to 128 KiB after serialisation. Values are stored with the structured clone algorithm, so Map, Set, Date and typed arrays round-trip intact, while a class instance comes back as a plain object with its prototype gone.
A value that grows past 128 KiB, such as an array of events appended to on every request, fails the write once it crosses the boundary, typically months after the code shipped. Split the data across keys using a sortable prefix and read ranges with the list options for start, end and limit, or use a SQLite-backed object and store rows in a table. get() also accepts an array of up to 128 keys in one call, which is far cheaper than 128 separate awaits.
Source: https://developers.cloudflare.com/durable-objects/api/storage-api/
durable-objectsstorage
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